KokuStudy smarter,
not harder
Koku is a flashcard app built for developers and power learners. Spaced repetition, Markdown support, offline mode, and more — all free.
Get started for freeEverything you need to learn effectively
FSRS spaced repetition
Cards surface right before you forget them, using the modern FSRS algorithm for optimal retention.
Markdown & syntax highlighting
Write cards in Markdown with syntax-highlighted code blocks. Perfect for studying programming concepts.
Offline mode
Study anywhere without internet. Your reviews queue locally and sync automatically when you're back online.
Keyboard shortcuts
Rate cards with 1-4, reveal with Space, undo with U, and more. Study without touching your mouse.
Image support
Add images to your cards with drag-and-drop. Mobile photos are automatically converted for the web.
Card templates
Create reusable templates for consistent card formatting, or start from scratch every time.
Make it yours
Customize your study environment to match how you like to work.
Light & dark themes
Switch between light and dark mode, or follow your system preference automatically.
Accent colors & fonts
Pick from 10 accent colors or set a custom hex. Adjust font size and family to your liking.
Tunable SRS settings
Control max new cards per day and fine-tune intervals to match your learning pace.
Your data, your way
No vendor lock-in. Import from Anki or export your decks anytime.
Import from Anki
Bring your existing Anki decks into Koku with .apkg file import.
Export anywhere
Export to Anki (.apkg), CSV, or JSON. Take your cards wherever you go.
Vacation mode
Going on a break? Pause all reviews and pick up right where you left off — no pile-up.